Difference between sent_bytes and sent_event_bytes in component telemetry

[mditsworth]

Hi all,

What is the difference between the component_sent_event_bytes_total metric and the component_sent_bytes_total? The docs indicate that the distinction is between "event bytes" and "raw bytes", but nothing more. In our use case where we are using a kafka sink, the component_sent_bytes_total matches what our broker is reporting as receiving, but component_sent_event_bytes_total is twice as large.

Thanks!

[pront]

Hi @mditsworth, this a nuanced topic. Hope the following explanation helps:

component_[received/sent]_bytes_total

• Only sinks emit component_sent_bytes_total. Transforms emit neither. This represents the number of bytes (not compressed) received or sent by the component. It is not the raw network bytes.

component_[received/sent]_event_bytes_total

This represents the estimated JSON size, in bytes, of the events sent by the component. For sinks, the sent_ value is reported before the sink enriches the event with any service integration-specific data.